[RFC][icedtea-web]: DownloadService implementation

[Saad Mohammad]

Hello,

The patch attached implements the core functionality of
DownloadService into IcedTea-Web. Please keep note that this patch does
not include the GUI implementations (DownloadServiceListener).

Synopsis of DownloadService:
    DownloadService is a jnlp service that allows an application to
    manage its own resources by:
        1) Checking if certain resources are cached.
        2) Downloading new resources and give access to the application
           for it to be used.
        3) Removing certain resources from cache.

    In all cases, the managed resources are not required to be mentioned
    in the jnlp file.

API:
http://docs.oracle.com/javase/7/docs/jre/api/javaws/jnlp/javax/jnlp/DownloadService.html

Reproducers and unit tests will be coming _very_ soon.

-- 
Cheers,
Saad Mohammad
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